Aluminium lithium hydride → 4-(4-Fluoro-phenyl)-4-methyl-pentanal

Temperature

-30 °C

To a solution of 4-(4-fluoro-phenyl)-4-methyl-pentanoic acid methoxy-methyl-amide (3.90 g) in tetrahydrofuran (70 ml) at −30° C. was added dropwise over 10 min a suspension of lithium aluminum hydride in tetrahydrofuran (15.4 ml, 1 M suspension). The mixture was stirred for a further 30 min at −30° C. and then cooled to −78° C. The mixture was quenched by dropwise addition of acetone (25 ml) and the mixture was then allowed to warm to room temperature. The mixture was then diluted with water and taken up in ethyl acetate. The mixture was washed sequentially with 1 N aq. hydrochloric acid and with saturated brine, then dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography (SiO2, heptane/EtOAc gradient) to yield a colourless oil, (1.62 g, 54%).

1. temperaturecooled to −78° C
2. customThe mixture was quenched by dropwise addition of acetone (25 ml)
3. temperatureto warm to room temperature
4. additionThe mixture was then diluted with water
5. washThe mixture was washed sequentially with 1 N aq. hydrochloric acid and with saturated brine
6. dry with materialdried over Na2SO4
7. concentrationconcentrated in vacuo
8. customThe residue was purified by column chromatography (SiO2, heptane/EtOAc gradient)
9. customto yield a colourless oil, (1.62 g, 54%)

ORD record

ord-9f44ce08319e42b0aca52527511d66e4

Source dataset

uspto-grants-2014_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08729113B2